Definition of kappa in English:
1The tenth letter of the Greek alphabet (Κ, κ), transliterated as ‘k’.
- It was initially adopted by the Greeks as koppa, to represent /k/ before a back vowel; but classical Greek preferred the letter kappa, the ancestor of K, and koppa fell into disuse.
- The text begins midsentence and continues with an enlarged marginal letter kappa on line 3.
- Greek proper names and placenames containing kappa are often written in English with "c" due to contemporary rendering into the Latin alphabet by ancient Romans.
1.2 [as modifier] Biochemistry Denoting one of the two types of light polypeptide chain present in all immunoglobulin molecules (the other being lambda).
- The NK1, kappa opioid, and CCRS receptors all have an amino acid composition similar to rhodopsin near the conserved Pro.
- Activation of kappa receptors blocked the induction of UP at the perforant-path synapses and this blockage can be reversed by naloxone 23.
- Fewer extra residues are needed for the light chain, possibly due to the higher initial homology between the mouse and human kappa variable regions.